WO2004013579A2 - Dispositif de mesure de la pression statique differentielle - Google Patents

Dispositif de mesure de la pression statique differentielle Download PDF

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Publication number
WO2004013579A2
WO2004013579A2 PCT/US2003/024572 US0324572W WO2004013579A2 WO 2004013579 A2 WO2004013579 A2 WO 2004013579A2 US 0324572 W US0324572 W US 0324572W WO 2004013579 A2 WO2004013579 A2 WO 2004013579A2
Authority
WO
WIPO (PCT)
Prior art keywords
tubes
plate
static pressure
distal end
duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2003/024572
Other languages
English (en)
Other versions
WO2004013579A3 (fr
Inventor
Bruce Roesler
Adrien De Borchgrave
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems Inc
Original Assignee
Duerr Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerr Industries Inc filed Critical Duerr Industries Inc
Priority to MXPA05001399A priority Critical patent/MXPA05001399A/es
Priority to CA002491261A priority patent/CA2491261A1/fr
Publication of WO2004013579A2 publication Critical patent/WO2004013579A2/fr
Publication of WO2004013579A3 publication Critical patent/WO2004013579A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements

Definitions

  • This invention relates to a static pressure measuring or activating device which measures or is responsive to air flow through a duct, pipe or tube using pitot tubes and a plate to amplify the differential static pressure for more accurate measurement.
  • Pitot tubes are commonly used to measure the stagnation pressure of a flowing fluid such as a gas or liquid.
  • a flowing fluid such as a gas or liquid.
  • the open end of the pitot tube is conventionally directed into the fluid and connected to a pressure-indicating device, such as a pressure gauge.
  • the instrument connected to the pitot tubes may be used to measure the differential static pressure drop and thereby the volume of gas flowing through a duct.
  • a typical pitot tube static pressure measurement device includes two pitot-type tubes each having a proximal end connected to a pressure transmitter, gauge, switch or the like and a distal end portion extending into the duct generally perpendicular to the gas flow.
  • the distal open ends of the tubes are bent or turned 90 degrees, such that the open end of one pitot tube is directed into the gas flow and the open end of the other pitot tube is directed downstream or away from the gas flow.
  • the present invention relates to a differential static pressure measuring or actuating device measuring or controlling gas flow through a duct, pipe, tube or the like.
  • duct is intended to broadly cover any passage conveying a gas, such as a pipe, tube or duct, wherein it is necessary or desirable to measure or control the flow of gas through the passage.
  • the differential static pressure measuring or actuating device of this invention includes two tubes, commonly referred to as "pitot tubes,” each including a proximal end located outside the duct and a distal end portion located in the duct, wherein the distal end portions of the tubes extend generally parallel and perpendicular to the air flow through the duct each having an open distal end.
  • a plate is located adjacent to and between the distal end portions of the tubes and the plate extends beyond the open distal ends of the tubes creating a differential static pressure or pressure drop between the open distal ends of the tubes.
  • a pressure gauge, pressure transmitter or pressure switch is then connected to the proximal ends of the tubes which may be connected to a control, such as a control for a gas fired burner, fan or the like.
  • a pressure transmitter or switch will also include a pressure gauge.
  • the open distal ends of the tubes are inclined toward the plate, most preferably toward a distal end of the plate spaced from the open distal ends of the tubes, preferably at an angle of between of 30 and 60 degrees such that the open end of one tube generally faces the gas flow and the open distal end of the other tube faces away from the gas flow.
  • a round plate has been found to be particularly suitable, wherein the distal open ends of the tubes are adjacent the center of the circular plate and the tubes contact the plate.
  • the size of the plate is not considered critical.
  • the plate should not interfere with the flow of gas through the duct.
  • the improvement in sensitivity and therefore accuracy results from the plate or disk amplifying the differential static pressure between the open distal ends of the tubes. Further, the plate averages out turbulence in the duct. Also, the differential static pressure measuring or activating device of this invention is less expensive to manufacture than conventional pivot tube instruments described above, wherein the distal ends of the tubes are bent outwardly and must be aligned with the gas flow, as described. Further, in the application described above, the fixed annular orifice plate may be eliminated resulting in a more substantial saving in cost in this application. Other advantages and meritorious features of the differential static pressure measuring or activation device of this invention will be more fully understood from the following description of the preferred embodiments, the appended claims and the drawings, a brief description of which follows.
  • Figure 1 is a partially schematic side view of one application of the differential static pressure measuring and activation system of this invention utilized to control a gas fired burner for heating an oven;
  • Figure 2 is a top cross-sectional view of Figure 1 in the direction of view arrows 3-3;
  • Figure 3 is a cross-sectional view of Figure 2 in the direction of view arrows 2-2;
  • Figure 4 is an end cross-sectional of Figure 3 in the direction of view arrows 4-4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the differential static pressure measuring or activating device of this invention may be used for example to measure or control the gas flow through a duct in many applications including, but not limited to the application disclosed in Figure 1.
  • Figure 1 illustrates schematically the use of a gas fired burner 20 to indirectly heat a chamber, such as the oven 22 schematically illustrated in Figure 1.
  • the gas fired burner 20 heats the air in the burner chamber 24 and the heated air is transmitted through duct 26 to a heat exchanger 28 as shown by arrow 30.
  • the heated air in the heat exchanger is transmitted through an exhaust duct 32 as shown by arrow 34.
  • the exhaust duct 32 is vented to atmosphere.
  • the oven 22 is then indirectly heated by circulating air in the oven through outlet duct 36, as shown by arrow 38.
  • the air is then received in the heat exchanger 28 and recirculated to the oven through inlet duct 40 as shown by arrow 42.
  • a fan (not shown) may be used to circulate the air from the oven to the heat exchanger.
  • the heat exchanger 28 is separated into at least two chambers by a baffle 44, such that the heated gas from the burner 20 does not come into contact with the air circulated from the oven, particularly where the oven contains combustible gases, such as volatile organic compounds present in a paint drying oven for example.
  • the NFPA Code also requires that the burner 20 be shut off in the event that gas (air) is not flowing through the exhaust duct 32. Therefore, the flow of the gas through the exhaust duct must be continuously monitored and the burner 20 turned off in the even that the gas flow through the exhaust duct 32 falls below a predetermined minimum volume or flow rate.
  • the differential static pressure measuring or activating device 46 of this invention will accomplish this function in a simple and reliable construction.
  • the differential static pressure measuring or activating device 46 is shown in more detail in Figures 2 to 4 and comprises two pitot-type tubes 48 and 50 each having an proximal end 52 located outside the duct 32 connected to a gauge 54 as shown in Figure 1.
  • the gauge 54 is connected by a line 56 to a valve 54 which controls the flow of gas to burner 20.
  • the proximal ends 52 of the tubes 48 and 50 extend through the wall of the exhaust duct 32.
  • the distal end portions 60 of each of the tubes extend generally parallel as best shown in Figures 3 and 4, each including an open distal end 62 as shown in Figures 2 to 4.
  • a plate 64 is located between the distal end portions 60 of the tubes 48 and 50 as best shown in Figures 3 and 4. As set forth above, the plate 64 creates a differential static pressure on opposed sides of the plate or a pressure drop across the plate which is measured by the pressure gauge 54. When the differential static pressure measured by the pressure gauge 54 through the pitot tubes 48 and 50 falls below a predetermined minimum differential static pressure, the pressure gauge 54 turns off the valve 58, shutting off the burner 20.
  • the open distal ends 62 of the tubes 48 and 50 are inclined toward the plate 64 as shown in Figure 3 such that the open distal ends 62 open toward and away from the direction of the gas flow as shown by arrow 34 in Figure 1.
  • the shape of the plate 64 is not critical, it has been found that a circular plate as shown in Figure 2 provides excellent performance, wherein the open free ends of the tube 62 are adjacent the center of the circular plate.
  • the plate 64 may be welded or otherwise secured to the tubes 48 and 50 or secured by any other suitable means including clamps.
  • the differential static pressure measuring or activating device of this invention may be utilized for many applications to measure or control gas flow through a duct.
  • the oven assembly shown in Figure 1 is only one example.
  • the pressure gauge 54 of Figure 1 may simply be a pressure gauge to measure the volume of flow through the duct 32 wherein the gauge is, for example, a magnehelic pressure gauge and may then be used to control the speed of a fan, for example, to maintain a predetermined volume of gas flow for example.
  • the tubes 48 and 50 may be conventional pitot tubes having a 3/8 inch diameter, for example,' and may be formed of steel, preferably stainless steel.
  • the plate 64 which may also be formed of steel, amplifies the static differential pressure providing more accurate measurement of the volume of gas transmitted through the duct 32.
  • the gauge 54 may also incorporate a switch which actuates the valve 58 controlling the gas fired burner 20 as disclosed above.
  • the plate 64 may be of any suitable configuration provided it does not obstruct the flow of gas through the duct 32. However, a round plate has been found to provide excellent performance with minimal resistance to gas flow.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un dispositif d'activation ou de mesure de la pression statique différentielle, servant à mesurer l'écoulement fluide à travers une conduite. Le dispositif selon l'invention comprend deux tubes de Pitot ayant chacun une extrémité proximale raccordée à une vanne, une partie terminale distale située dans la conduite, les parties terminales distales étant généralement parallèles entre elles et perpendiculaires au flux d'air à travers la conduite et présentant des extrémités distales ouvertes, ainsi qu'une plaque située entre les deux parties terminales distales des tubes et créant une pression statique différentielle entre les extrémités ouvertes des tubes. Les extrémités distales ouvertes des tubes s'inclinent en direction de la plaque, de sorte qu'elles se trouvent en face et à l'opposé du sens du flux gazeux à travers la conduite.
PCT/US2003/024572 2002-08-05 2003-08-05 Dispositif de mesure de la pression statique differentielle Ceased WO2004013579A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
MXPA05001399A MXPA05001399A (es) 2002-08-05 2003-08-05 Dispositivo medidor de presion estatica diferencial.
CA002491261A CA2491261A1 (fr) 2002-08-05 2003-08-05 Dispositif de mesure de la pression statique differentielle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/212,529 US6820501B2 (en) 2002-08-05 2002-08-05 Differential static pressure measuring and activating device and control mechanism
US10/212,529 2002-08-05

Publications (2)

Publication Number Publication Date
WO2004013579A2 true WO2004013579A2 (fr) 2004-02-12
WO2004013579A3 WO2004013579A3 (fr) 2004-06-17

Family

ID=31187787

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/024572 Ceased WO2004013579A2 (fr) 2002-08-05 2003-08-05 Dispositif de mesure de la pression statique differentielle

Country Status (4)

Country Link
US (1) US6820501B2 (fr)
CA (1) CA2491261A1 (fr)
MX (1) MXPA05001399A (fr)
WO (1) WO2004013579A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414032A (zh) * 2018-03-13 2018-08-17 太原理工大学 一种便携式明渠自动测流装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4636428B2 (ja) * 2003-12-05 2011-02-23 横河電機株式会社 多変数伝送器及び多変数伝送器の演算処理方法
DE102005052230B4 (de) * 2005-11-02 2009-01-15 Institut für Luft- und Kältetechnik gGmbH Zaunsonde und Verfahren zur Volumenstrombestimmung
US8696417B2 (en) * 2008-07-11 2014-04-15 Nehp Inc. Modular exhaust gas header and method of incorporating same in design layout for a manufacturing process machine
US9506668B2 (en) * 2011-05-03 2016-11-29 Broan-Nutone Llc Make-up air system and method
CN103308713A (zh) * 2013-06-04 2013-09-18 上海东富龙科技股份有限公司 应用于隧道式灭菌烘箱的新式风速测量系统
US10184678B2 (en) 2013-09-06 2019-01-22 Carrier Corporation System and method for measuring duct leakage in a HVAC system
US11084058B2 (en) * 2018-10-01 2021-08-10 Gallagher-Kaiser Corporation Scrubber unit for a paint booth
CN117968197B (zh) * 2024-03-29 2024-05-28 中国海洋大学 基于自适应卡尔曼滤波的智能风量测控系统及测控方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5458006B1 (en) * 1990-08-30 1997-05-13 Pacific Energy Gas-metering device
US5879499A (en) * 1996-06-17 1999-03-09 Heartport, Inc. Method of manufacture of a multi-lumen catheter
US5705751A (en) * 1995-06-07 1998-01-06 Setra Systems, Inc. Magnetic diaphragm pressure transducer with magnetic field shield
US6041659A (en) * 1998-07-09 2000-03-28 Honeywell Inc. Methods and apparatus for sensing differential and gauge static pressure in a fluid flow line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414032A (zh) * 2018-03-13 2018-08-17 太原理工大学 一种便携式明渠自动测流装置

Also Published As

Publication number Publication date
WO2004013579A3 (fr) 2004-06-17
MXPA05001399A (es) 2005-04-28
US20040020304A1 (en) 2004-02-05
CA2491261A1 (fr) 2004-02-12
US6820501B2 (en) 2004-11-23

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